Statistical monitoring method of citric acid fermentation liquefaction clear liquid based on near infrared spectroscopy

Abstract

The invention relates to a statistical monitoring method for citric acid fermentation liquefaction clear liquid based on near infrared spectroscopy. The method comprises the following steps: acquiringand preprocessing input and output data, dividing a data set into two parts, namely marked data and unmarked data, establishing a semi-supervised PPLS model, and calculating monitoring indexes. The method has the beneficial effects that the values of total sugar and total nitrogen are analyzed by mainly adopting manual sampling in the citric acid liquefaction clear liquid process, then the operation state of the process is judged according to the operation experience, an alarm is given afterwards, the alarm can be given only after the product quality is changed, a large amount of waste is caused, and the subsequent citric acid fermentation production is influenced. According to the method, the near infrared spectrum is introduced to detect the process of liquefying the clear liquid by thecitric acid, so that statistical monitoring is realized.

Description

technical field [0001] The invention relates to the field of citric acid fermentation, in particular to a statistical monitoring method for liquefied clear liquid of citric acid fermentation based on near-infrared spectroscopy. Background technique [0002] The citric acid fermentation liquefaction liquid is the product of corn as raw material: firstly crush the corn to obtain corn flour, then add water to dilute it into corn steep liquor, mix sugar water and process water to obtain feed water, adjust it with NaOH, and mix corn steep liquor and feed water in Mix in the batching tank, add amylase to obtain the feed liquid, enter the primary injector, and then divide the feed liquid into two paths, one into the seed mixing tank, one into the secondary injector, add amylase to the feed liquid to obtain a mixed liquid, and adjust with waste acid pH, used for solid-liquid separation, the mixed liquid is separated through the plate and frame after being cooled by the cooler, and t...

AI Technical Summary

Problems solved by technology

However, when establishing a calibration model for near-infrared spectroscopy, it is usually necessary to have the same sampling rate for process variables and quality variables, and in the process of citric acid liquefaction supernatant, near-infrared spectroscopy analysis is fast, and the off-line sampling period of total sugar and total nitrogen long

Most of the previous methods used the method of downsampling rate. According to the sampling time of total sugar and total nitrogen, different spectral data were selected to make the sampling rate of the two consistent, and the model of total sugar and total nitrogen was established, but a large number of nearly Infrared spectrum information will reduce the accuracy of modeling

After the calibration model is determined, the total sugar and total nitrogen values ​​are usually estimated according to the model, and then the upper and lower limits are used to monitor the liquefied clear liquid, which is a monitoring method of post-alarming, which will inevitably lead to a lot of waste

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